摘要
采用离散元法DEM(Discrete element method)对包衣锅内冰草种子和粉料在振动状态下的混合均匀度进行了数值模拟研究,同时建立颗粒运动模型,接触模型采用Hertz-Mindin无滑移模型。选取振幅、振动频率和振动方向作为影响因素,分别设立3个水平,进行种粉混合的正交试验模拟。采用种粉碰撞接触系数q和混合趋于稳定的时间作为试验指标来评价种粉间的混合均匀性,并对3个因素进行极差分析,结果表明:振动方向和振动频率对混合趋于稳定的时间的影响显著,振幅对混合趋于稳定的时间的影响不显著;振动方向和振幅对碰撞接触系数的影响显著,振动频率对碰撞接触系数的影响不显著。综合评估后采用振动方向为Z方向、振幅为8 mm和振动频率为20 Hz能获得最佳的混合效果。研究结果对在振动状态下种粉间的混合提供参考依据。
The discrete element method(DEM)was used to study the mixing uniformity of the Agropyron seeds and powder in the coating pot under vibration,a particle motion model was established,and the Hertz-Mindin without slippage model was taken as the contact model. The amplitude,vibration frequency,and vibration direction were selected as the influencing factors. Three levels were set up,and the orthogonal experiments of seed powder mixing were performed. The contact coefficient of seed powder collision q,and the time for mixing to be stable were used as the test indicators,to evaluate the mixing uniformity between the seed powders,and a range analysis of the three factors was carried out. The results showed that the vibration direction and frequency had significant effects on the time of the mixing to be stable. The influence of the amplitude on the time when the mixing became stable was not significant. The vibration direction and amplitude had a significant effect on the collision contact coefficient,but the vibration frequency had no significant effect on that. After the comprehensive evaluation,the best mixing effect could be obtained by using the vibration direction as the Z direction,the amplitude as 8 mm,and the vibration frequency as 20 Hz. The research results provided a reference for the mixing of seed powder under vibration.
作者
戴念祖
侯占峰
仇义
张曦文
DAI Nianzu;HOU Zhanfeng;QIU Yi;ZHANG Xiwen(College of Mechanical and Electrical Engineering,Inner Mongolia Agricultural University.Hohhot 010018,China)
出处
《内蒙古农业大学学报（自然科学版）》
CAS
2022年第3期80-85,共6页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
内蒙古自治区自然科学基金项目(2018MS05023)。
关键词
冰草种子
粉料颗粒
EDEM
离散单元法
振动
混合
Agropyron seeds
Powder particles
EDEM
Discrete element method
Vibration
Mixing
